https://bugs.winehq.org/show_bug.cgi?id=5129
--- Comment #25 from Grant ggustaf@math.utah.edu --- Confirmed that the reinstall of winetricks into Mint 17.3 followed by running winetricks and selecting comctl32 to add caused the bug to vanish in default wine 1.6.2 and Faststone 5.5. Previously this failed to remove the bug.
The "fix" is untested in Mint 18 or 19.
Temporary workarounds cited in message 22 https://bugs.winehq.org/show_bug.cgi?id=5129#c22 still apply on other version combinations of wine and faststone.
The comctl32 fix also worked on a Lenovo laptop /w mint 17.3, which was running Faststone 5.5 under default wine 1.6.2. The version of winetricks was the latest and there was no re-install of winetricks. Ran wintricks from a terminal, clicked options to add comctl32. Exited winetricks, ran FastStone again and the bug was gone.